Superman Syndrome, or Premises that depend on people being Giant Idiots

You guys know what I'm talking about--that episode where normally competent, logical and sane characters lose their collective minds in order for a plot to happen. My personal favorite (and by 'favorite' I mean 'most hated') is the Stargate: Atlantis season two episode The Long Goodbye, where the same people who were nearly blown up by a starship commander with an alien entity in his head the episode before, decide to let alien entities into the heads of the military commander and leader of the entire expedition. Naturally this goes just as badly as you'd expect. Hyjinks ensue.

But nowhere, nowhere, is this example of joint idiocy more prevalent than in any plot requiring a normally intelligent character to somehow not recognize another character in a flimsy disguise.

Arrow, of course, is a perfect example of this. And while I know that the whole show would collapse if Officer Quentin Lance ever noticed how very similar Arrow's height, breadth and the lower half of his face was to Oliver Queen, or if Laurel Lance ever recognized the enormous cleft in The Canary's chin as belonging to her sister, the absolute impossibility of this lack of recognition is both hilarious and irritating as hell.

I mean, we're not talking Batman-esque cowls here. We're talking teeny little eye masks with a wig and/or a hood. As an example, I made a hero of my own:

My husband by day...

And as a badass superhero! Let's call him, 'The Engineer'.

I know that none of you know him as well as I do, but seriously. How long would it take you to recognize him after speaking to him face-to-face day after day for several minutes at a time? And his nifty steampunk goggles actually make his eyes harder to see than the characters' eyes in the show. Quentin is a cop, for Pete's sake. His daughter Laurel is a hotshot lawyer. Presumably they'd be good at noticing stuff, like how similar those two vigilantes are to people they've known for decades.

"I can't help but feel I'm missing something."

Or if that's too much to ask, what about the fact that The Arrow and The Canary only appeared shortly after Oliver Queen and Sarah Lance returned from the dead?